lazysizes
High performance and SEO friendly lazy loader for images, iframes and more. Many features, like low-res Blurhash placeholders and image fade-in
5(6 reviews)
·700 active installs·Updated 5 years agoAs of April 2026, lazysizes is a WordPress image plugin with 700 active installations and a 5/5 rating from 6 reviews. It has been downloaded 18K+ times in total. Requires WordPress 3.9+ and PHP 5.6+. Available on WordPress.org since 2017. Last updated 5 years ago — may have compatibility concerns. Top alternative: Firelight Lightbox.
5/56 reviews
700active installs
18K+total downloads
9 yearssince 2017
Overview
lazysizes is a WordPress plugin for the high performance, SEO-friendly and auto-triggering lazyloader with the same name. Support includes images (including responsive images with srcset and the picture tag), iframes, scripts/widgets and much more. It also prioritizes resources by differentiating between crucial in view and near view elements to make perceived performance even faster. Additionally, you can add low-res/blurry placeholder images using the Blurhash algorithm.
This plugin works by loading the lazysizes script and replacing the src and srcset attributes with data-src and data-srcset on the front end of a WordPress site. When a post or page is loaded, the lazysizes javascript will load the images, iframes etc. dynamically when needed. All you need to do is to enable the plugin,…
Ratings & Reviews
56 reviews
5 ★
6
4 ★
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3 ★
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2 ★
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1 ★
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Compatibility
| WordPress | 3.9+ requiredTested up to 5.5.18 |
| PHP | 5.6+ required |
Top Alternatives to lazysizes
Frequently Asked Questions
Changelog
1.3.3
- Add support for WordPress 5.5 and native lazy loading (see point below).
- Add option for full native lazyloading, which gives the browser full control over when to load the image. Not compatible with the old native lazy load option, which only gives the browser partial control over loading. Currently only supports images, other elements will be lazyloaded like previously.
- Add support for transforming HTML using single quotes instead of double quotes for a…
Contributors
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.